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Question
A student is testing water to know which is best for cleansing purposes with soaps. He would find that the cleansing action of soaps is best when he uses water obtained from
(a) rain
(b) tap
(c) hand pump
(d) pond
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Solution
Rain does not conatin any such salts that cause hadeness of water. So, among the given sources of water, rain would show best cleansing action of soaps.
Hence, the correct answer is option (a).
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